Answer:
y = -1x - 79
Explanation:
Formula is y = mx + b
m is slope
slope = change in y / change in x = (-23 - -15) / (-56 - -64) = -8/8 = -1
m = -1 so equation is now y = -x + b
Now to find b, substitute any coordinate from the table in the equation. Let's use (-64, -15).
y = -x + b
-15 = -(-64) + b
-15 = 64 + b
-79 = b
So the equation is y = -1x - 79